Chapter 5, Problem 5.30QP

Interpretation Introduction

Interpretation:

The density of a gas much lower than other phases under atmospheric condition and the unit of the density of gases has to be discussed.

Concept Introduction:

Gases aren't especially intense compared to solids and liquids, except they still have a density.  Density is distinct as mass per volume, and the relation between mass and moles of course is the molecular weight, ${\text{M}}_{\text{w}}$.  The reader may have noticed that in the examples above, we really didn't care which ideal gas we talked about, just that it was ideal.  Frequently with density calculations, we require to know what gas we are talking about so we can calculate its molecular weight and thus put mass into the calculation.

  ${\text{M}}_{\text{w}}\text{=}\frac{\text{m}}{\text{n}}$

Someplace ${\text{M}}_{\text{w}}$ is the molecular weight in grams per mole (g mol^-1), m is the mass of the sample and n is the number of moles.